Screen-door attachment



Dec. 4, 1928; 1,694,168 O. V. DUSA SCREEN DOOR ATTACHMENT Filed Sept. 15, 1927 M77295: es W Patented Dec. 4, 1928.

OLIVE V. DUSA, OF GLADSTONE, OREGON.

SCBEEN-DOOR ATTACHMENT.

Application filed September 15, 1927. Serial No 219.719

This invention relates to a new and useful improvement in a screen door attachment, and more specifically useful for scattering or otherwise dispersing the flies that gather at the screen door, being attracted there by the odors that emanate from the opening or the warm air that emits therefrom, the object being to cause the flies to disperse from the door before the same is opened, and because of their dispersal, they will not enter the opening into the interior of the house during its period of opening and closing. This is accomplished by mechanism comprised of a series of arms having attached thereto fan like members that are rotated about a journal and swing close to the screen when revolved thereby dispersing the assembled flies, the revolving arms may be rotated by manually operated means, or they may be operated by a power action that 18 released for one cycle of operation each time the screen door knob is actuated for the purpose of opening or unlatching the door. Means is provided for the hand winding of the power actuating means and for maintaining the power in the wound position until the same is released by the actuation of the door knob.

I attain these objects by the mechanism illustrated in the accompanying drawings in which- Fig. 1 is a front elevation of a screen door having my attachment secured thereto and in place upon the door. Fig. 2 is a partial front elevation of the attachment in place upon the door and illustrates the actuating means connecti the door knob and the attachment for revolving the arms carrying the fans. Fig. 3 is a front elevation of the case containing the operating means for the revolving arms with the case or cover partially removed to show the power means and the means for stoppin the mechanism after a single revolution of t e same. Fi .4 is a front elevation, also, of the case but 0 the rear elevation also having the case, or cover, partially removed and showing the gear relationship and the pawl for maintaining the gears in position during the winding of the power means. Fig. 5 is a section of,the case and mechanism in place upon the cross member of the screen door, and is made to show theinner construction of the attachment.

Similar numerals refer similar parts throughout the several views.

1 is the frame of the door, 2 is the vertical frame member of the door to which is fastened the revolving attachment, 3 is the horizontal frame member which intercepts the vertical member at or near the center of the door, and to these two members the attachments are fastened, 4 is the case of'the power contained members, and 5 is the cover member of the same, 6 is the main journal shaft to which the motive spring 7 is fastened by passing an end of the spring through a slot in the shaft as shown at 9, While I have shown the motive spring secured to the shaft in this manner I do not wish to be limited to a fastening of this kind as it is apparent that other suitable fastenings may be used. The other end of spring 7 is attached to the outer case 4 as shown at 8 by a suitable hook arrangement. Also attached to journal, or shaft 6 is gear 10 which engages and meshes with gear 11 which is secured to shaft 12, als0 secured to shaft 12 is crank 13 whichis so arranged that the same may be interchangeably used on shaft 6 for winding up the motive spring 7 which is attached thereto. Attached to the other or outer end of shaft 12 is a hub 14 which serves as a mounting for the fan bearing arms 15 which are here shown as four,

in number but I do .not wish to be limited to any certain, or specific number of fan. hearing arms. 16 is a fan attached to each of the arms, which may be made -in any suitable shape to increase the area of the outer part of the arms to better disperse the flies that may assemble upon or about thescreen. A further object of these fans and the arms upon which they are fastened is to act as a governing device for the starting of therotation of the motive spring, for, because, of the area of the fan members and their location at, or near, the outer extremity of the arm they canifiolt1 be instantly and immediately be set in u which they are attached for one revolution or one cycle of operation. 17 is the screen door knob w ich is of the usual form and for the usual purpose, attached to a knob shaft which passes through the door and to the other end of which is secured a second knob is a lever arm 18 to which is attached rod 19 which connects with bell crank 21, the same'being pivoted about pin 22, as a reaction for rod 19 is tension spring 20 which in its normal position is shown in the full'lines of the bell crank in Fig. 2. Attached to the other end velocity by the release of the shaft on i of the bell crank 20 is rod 23 which is attached desires to enter or leave the room through the screen door to which the same is attached by means of the hand crank lever just before the door is opened, and by that means the assembled flies ma be dispersed, or the results may be obtained y the turning of the knob of the screen door momentarily before entering or leaving the room through the door, at which time the motive spring will be released for a single cycle of operation, and in so doing the flies. will be dispersed by the operation of the attachment. It should be stated that the stop pawl 24 engaging notch 25 a sufiicient depth that the pawl will not disengage the notch if the knob is turned only a suflicient distance to unlatch the door for opening but that the same must be turned an appreciable I amount further, if this is not done the mechanism will be set in motion on the return of the door to the normal, or closed position, whereas, when this provision is made the cycle of operation will, only, occur when the operator of the door turns the knob a sufficient distance to disengage the stop awl.

Having thus described my invention in sufficient detail to enable any one skilled in the art to make the same I wish to make the following claims therefor:

1. The combination in a screen door attachment, of arms having fan like members 40 attachedv thereto, said arms being attached to a shalt mounted on a case attached to a rigid cross member of the screen door, motor means attached to the case adapted for winding, gear means connecting the motor means with the shaft carr ing the arms, and means for the releasing o the gear for one cycle of operation all for the purpose as specified and described.

2. The combination in a screen door ated through a train of gears to the shaft mounting the arms, connecting means between the spring and the knob of the screen door for releasing the .motor means for one cycle of operation of the mechanism, and

means adapted to the winding of the motor to spring, all for the purpose as specified and described.

3. In combination with a screen door and its knob; of a spring motor carried by said door and including a ratchet and pawl mech- 65 amsm restraining sald motor from operatiom a connection between the pawl and door knob arranged to release the pawl upon turning of the knob, and a fly brush actuated by the motor.

OLIVE V. DUSA. 

